Study on High-energy Particle Acceleration Mechanism during Solar Flares

我们对太阳耀斑期间的能量释放过程和粒子加速机制作了以下几点明确。(1)发现磁重联过程存在两种类型；太阳耀斑中两个电流环合并时的完全和部分重联。这些类型的重连接是由YOHKOH观察到的。(2)得到电流环碰撞电流存在三种类型；I Y和X型它们有不同的能量释放特征。我们在YOHKOH数据中发现了I型和X型合并过程，这与我们的理论结果吻合得很好。(3)通过MHD模拟发现，在两个电流环碰撞过程中，可以在很短的时间内产生快速磁声激波。(4)通过三维粒子编码发现，在两电流环碰撞过程中会产生等离子体波和哨声波，并对等离子体加热起作用。(5)在考虑冷却效应的情况下，两电流环合并过程对日珥的形成起着重要作用。

We made clear the following points about the energy release process and the particle acceleration mechanism during Solar Flares.(1)We found that there exist two types of magnetic reconnection process;Complete and Partial reconnection during the two current loop coalescence in solar flares. These types of reconnection were observed by the YOHKOH.(2)We showed that there exist three types of current of current loop collision;I,Y and X type and those have different signatures for the energy release. We found I and X type coalescence processes in the YOHKOH data, which show a good agreement with our theoretical results.(3)We found that during two current loops collision the fast magnetosonic shock waves can be generated within a very short time by MHD simulation.(4)We found by 3D particle code that during two current loops collision plasma waves and whistler waves can be generated and mat contribute to plasma heating.(5)We found that two current loop coalescence process is important for the prominence formation,if we take into account the cooling effect.